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Theoretically shaves 78658 bytes[1] off of resources.pak's on-disk size
(which is especially helpful on Android).

R=agrieve@chromium.org,smaier@chromium.org
BUG=619091

[1] https://docs.google.com/spreadsheets/d/1iHF05utMcECxc8tb3ziHQlEJmXlk98-PFWhkGoY545Q/edit

Review-Url: https://codereview.chromium.org/2152143002
Cr-Commit-Position: refs/heads/master@{#419110}